Locking bushing (20, 36) for a threaded clamp (18) fastened to be screwed into a bone piece (14) with said bushing undertaking a first part (22, 38) with an axial reaming (24,42) to receive said clamping clip, the periphery of said first portion being threaded to cooperate with a clamping plate, said bush further comprising, in the extension of said first part, a deformable second part (28,44) of smaller thickness than the first part , characterized in that the first part and the second part have an identical axial reaming (30, 46), and that the thickness of the second part is chosen according to the material with which the bushing is constituted, so that the shearing of the clip (18) and the bushing (20) at the level of the joint between the first part (22) and the second part (28) deforms the remaining part (34) of the second part (28) of the locking bushing (22) towards the clip (18) so that a bl is obtained stapling of the clip (18) with respect to the locking sleeve (22) by crimping.Casquillo de bloqueo (20, 36) para una grapa (18) fileteada de sujeción destinado a ser atornillado en una pieza ósea (14) emprendiendo dicho casquillo una primera parte (22, 38) con un escariado axial (24,42) para recibir dicha grapa de sujeción, estando la periferia de dicha primera parte fileteada para cooperar con una placa de sujeción, comprendiendo dicho casquillo además, en la prolongación de dicha primera parte, una segunda parte (28,44) deformable de menor espesor que la primera parte, caracterizado porque la primera parte y la segunda parte presentan un escariado axial (30, 46) idéntico, y porque el espesor de la segunda parte se elige en función del material con el cual está constituido el casquillo, de modo que el cizallado de la grapa (18) y del casquillo (20) a nivel de la unión entre la primera parte (22) y la segunda parte (28) deforma la parte restante (34) de la segunda parte (28) del casquillo de bloqueo (22) hacia la grapa (18) de modo que se obtenga un bloqueo d
